One experiment was conducted to compare an early weaning program, using a
prestarter , when calves were weaned at 2 or 3 wk of age with programs using
conventional feeds and weaning at 3 or 6 wk of age. Daily gains to 8 ...

Stage of the estrous cycle, time of insemination, and season of the year were
examined for their influence on estrus and fertility of 223 Holstein heifers after
prostaglandin F2α(PGF). Heifers given PGF early in the ...

To study the effects of gonadotropin-releasing hormone (GnRH) and timing of
artificial insemination (Al) on fertility, 328 dairy cows were divided into four
groups. Inseminations at first, second, or third service were ...